How to keep messages unread in the Gmail after reading it in Blackberry 9700

Hi, I am a blackberry 9700 user since last august but still I am not aware about the functions provided by the phone. Anyways as mentioned in the title please let me know how can I tag a messages in the Gmail as “unread” once after reading it through the mobile? Any suggestion for the same will be appreciated.

This is quite simple as you need to simply Mark the messages 'unopened' that were to unread!

And for that you have to simply highlight the message that is read from the device >> press Menu button and select “Mark Unopened” option and those messages will be displayed again as unread.

Though I am agree with the above user but I don’t think the one he had mentioned will work with the Gmail as well, because it seems like it could be for the general text messages only. But still you should try it for sure.