Verified answer

Open your blackberry messenger application. Click on the menu key, then add a contact, select by email or pin. If by email, choose the persons email address or choose add once and custom out their info in.

To add a contact to the BlackBerry Messenger Contacts list, complete the following:

On the BlackBerry, open BlackBerry Messenger.

Display the menu and click Add a Contact. The Select Address screen appears.

Add a contact from your address book by clicking the contact name. Or, add a new contact by selecting Use Once, entering the contact email address and clicking the trackwheel. The contact email address is added.

Display the menu and select Request Email<user_name>. The Add a Message screen appears.

Click OK. The Add a Message is sent to the contact. You may customize this invitation before sending it. The contact is added to your contact list once the invitation is accepted.

I had this prob too. Did you add the other person's email address, pin, or phone number to your address book. I have seen sometimes it will not accept unless the pin is entered ( but doesnt have to be). Then just go to the BB MSGR add contact>select the contact. Then make sure the person accepts ur request. You should be good to go! Hope this helps.

***to be on the safe side, I would get the other persons PIN number and add it to the address book.

Almost forgot....you may also want to create a new address with only the persons PIN then try sending the msgr request.

These are just some things I've had to do!