When you make posts on the message boards, Feesch looks for certain keywords in your post like the names of Feesch groups and automatically adds links.
Usually those links are very relevant and useful to other members, eg:
"Hey did you see that episode of Lost last night?"
Unfortunately, sometimes it's not quite so relevant, eg:
"Hey I think I might have lost my phone last night!"
If you really don't want it to link to something irrelevant, then just change your post and put asterisks around the word or phrase (the asterisks will be hidden), eg:
"Hey I think I might have *lost* my phone last night!"