Adriano Faria

Have you enabled it in the ACP? If don’t, type Picks in the ACP search and enable it.

It’s the profile field. If the user fill this field (or any other Editor profile field) will appear as a new tab in user profile. 

See the method attachmentLookup. It’s wrong. 
Open same extension from any other and compares to yours.

Enable HTML posting for your group. 

/* If we don't have any available payment methods, show an error */ if ( \count( $paymentMethods ) === 0 and !$amountToPay->amount->isZero() ) { \IPS\Output::i()->error( 'err_no_methods', '4X196/3', 500, 'err_no_methods_admin' ); }  

downloads_files contains file information, like file name, submitter, date, path, category, number of comments/reviews, ratings, etc.
downloads_fields and downloads _ccontent contains extra fields information. 
downloads_downloads contains information about who downloaded a file and when.

ACP -> Community -> (Forums) Settings -> Topic Summary Settings

Not out of the box.
This plugin adds a block but not a sidebar block:
 

@Karina Harumi, o idioma oficial aqui é inglês. Dificilmente alguém irá traduzir e postar.
Use o Google Translator e edite seu post. Suas chances aumentarão.

Make sure your configuration method starts with:
public function configuration( &$form=null ) { $form = parent::configuration( $form );  

Edit the group and add the FA icon in the Group Formatting. Example:
Will produce:

 

 
You can also give users the ability to add their own FA icons:
 

Orphaned attachments are deleted regularly on a task that runs once per day, if I’m Not mistaken. 
If you want to test it, go to Tasks and find one related to attachments or clean and run the task.
EDIT: The task is cleanupattachments and runs at every 12 hours.

Version 1.0.1 submitted to the marketplace:

User can't create new topics in the chosen forums:


Or reply to existing topics in chose forums:

Yes, on ACP go to Notifications Settings and find A new member requires admin validation on Member Accounts. 
On a side note, take a look at this plugin:
It can save you some time.

You don’t have it, thus it doesn’t show. 
You have to purchase it. After that install it: 
 

Admin CP -> Applications -> click in System -> Profile -> click in the padlock-> remove Guests from the selection. 

Account Settings-> Security and Privacy. 
It’s an account feature from now on. 

I’ll send a PM with the template when I reach my PC, if no one else helps here first. 

If you're talking about this resource, it's just like create a topic. Create a category, give permission for those can create the link (record) and then click to create a new link. Give a title, the URL and the content and hit save. You're done. The app will add a screen capture of the site as the image record.

Quick example, obviously not tested:
/** * Build Registration Form * * @return \IPS\Helpers\Form */ public static function buildRegistrationForm( $postBeforeRegister = NULL ) { $form = parent::buildRegistrationForm( $postBeforeRegister ); $form->add( new \IPS\Helpers\Form\Text( 'field_name', NULL, TRUE ), 'password_confirm' ); return $form; } /** * Create Member * * @param array $values Values from form * @param array $profileFields Profile field values from registration * @param array|NULL $postBeforeRegister The row from core_post_before_registering if applicable * @return \IPS\Member */ public static function _createMember( $values, $profileFields, $postBeforeRegister = NULL ) { $member = parent::_createMember( $values, $profileFields, $postBeforeRegister ); $member->field_name = $values['field_name']; $member->save(); return $member; }