How do you text on a black berry 7290 - RIM BlackBerry 7290

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1.In a messages list, click the trackwheel.
2.Click Compose SMS.
3.Click [Use Once].

4.Click SMS

5.Type the SMS-compatible phone number.

6.Click the trackwheel.

7.Click Continue.

8.Type a message.

9.Click the trackwheel.

10.Click Send.

If you have added contacts to the address book, you
can select a contact from the list after you click
Compose SMS.

To send an SMS message quickly from the phone, type
an SMS-compatible phone number. Click the
trackwheel. Click SMS<XXXXXXX>.

Check out the manual from this link.

Rating the solution is highly appreciated if you feel helped.
Good luck and have a nice day