To see invites you have received, click the Network tab, and then click Invites. Here you'll see all pending invites.
To respond to an invite you have received, click the company name.

To accept, click "Accept this Invitation". If the company is already in your customer and/or vendor list, select them from the drop-down menu(s). If not, select "Add New", and we'll add them for you.
To reject, click Reject. If you change your mind later, you can return to their Profile page and click "Changed your mind?"