Webmasters can accept all membership requests, except new Webmaster requests.
Team Admins can accept membership requests associated with the team they are an admin of.
If you cannot accept a request, it is most likely due to you not having the correct permission (see below).
You should contact your Primary Webmaster to approve the request if you are unable to do so.
To see any membership Requests:
Login to your Club Control Panel.
Click the Membership tab.
Click Requests in the left side menu.
Any outstanding Membership Requests will be listed.
You can Accept / Reject / Ignore the request as appropriate.