There are different levels of access (“roles”) in a WordPress website. The top level of access is Administrator.
If you are logged in to your website, you can look for the Users tab in the WordPress admin dashboard. If you see options to add or delete users in that tab, then you are probably an Administrator of your website.
If you don’t see that option, and if you can’t see a Plugins tab in the admin dashboard, then you have been assigned a role that is lower than Administrator. You may need to talk to your regular web developer/support person to get your account upgraded to Administrator.
If you’re not sure, we’ll help you figure it out after you contact us.