Verb conjugation of "situer" in French

In order to improve the language skills we changed some features on Vocabulix. From now on users can not only drill isolated lesson but adhere to a specific lesson plan. That means that they can set goals and seek help from other users.
Usually we write these messages twice a week. We also have a fanpage in Spanish where we need to write short messages. It is actually pretty boring but people respond to it. Don't ask me why they are doing it.
If you are spell checking my letters, that would be great. I would then do the same with your letters. Can you please correct this email too? I thank you in advance for helping my Spanish.