Valerie Huard

If that is what they provide you, yes.
You would need to contact your theme author if you want to match your WordPress site.

The only way to perform this would be to also add these in Invision Community. You would need to contact HubSpot to see what that would take. If it is just adding a snippet of Javascript code to the head or footer of the website, that can easily be done. However, if there is more customization going on, that would require a third party provider to develop this for your community.

Upgrading usually only takes several minutes provided you have input the correct information on those other tabs you are seeing in the image.

To check what version you're running, click on the "Support" link in the upper right of your ACP.  
It should tell you what version you're running such as:

If you want to check to see if your site is able to run the IPB software, you can use the compatibility checker:
But in a nutshell one of the major requirements is PHP 8.0 or 8.1.  7.4 technically works right now, but PHP 7.x support ends in November and as a result in the November release, IPS will be removing support for it.  So I would just stick with 8.0.x or 8.1.x.  Full details can be seen when you run that script.  

Thanks @Randy Calvert.
If you encounter any further issues please don't hesitate to reach out, @Valerie Huard.