Hi @Dorit Mozesh,
The "Administer Jira" permission has the ability to create projects, so you will need to log in as the site-admin and set the Global Permission to Administer Jira for the user or group that will be creating projects. Here are a couple of links with more information:
Only a site-admin can install an add-on product. If you are not the site-admin you'll need to ask that person to install it for you.
Hope this helps,
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