Laura and Adriana are bots. lol. Yeah, they are coded almost good and many people like you get brainwashed, if you did ofc. I cannot tell are you serious or joking here
Answer to your question, if you meant by "make it stay" like you create and save your sig, however it does not appear in your posts at all. This problem is solved by the following actions:
http://www.duelacademy.net/profile?mode=editprofile&page_profil=preferences
go there and scroll down to "Always attach my signature" line and tick yes. Then click on save at the end of the page.
That's it. All posts AFTER that change will have signature. This means do not look at your already created posts like these now above mine, because most probably sig will not show up there, but in new ones created afterwards. Just post somewhere after to see if it applied.