Head on over to https://foursquare.com/business/merchants/claiming to get started claiming your venues. If you're claiming between 10-100 venues or 100+ venues, we have two different forms for you to choose between (see links on bottom of page). 

If you need help finding your venues on foursquare check out this article:
http://foursquare.zendesk.com/entries/194987-why-doesn-t-my-venue-s....

If your venue does not yet exist in the foursquare database, you can add it here: foursquare.com/add_venue 
and include these venue URLs in the form.

Thanks for your interest in foursquare!