As you must know, it is a big advantage to trade links with another web site that is related you yours in content. The more links the beter your ranking in the major search engines.
Just copy and place the following text on your page.
E-mail me after placing my link on your page, with the following information. After I review your site, I will place your link on my site.
The URL where my link is found.
The category where you want your link to be placed.
The text or short description.
We will check periodically and if our link is not shown on your site, your link will also be pulled from our site.
Thank you for considering a link exchange with us.