Video Press – does not recognize my user id and password

I am very novice website builder.

I installed the VideoPress plug in as I would like to post several videos to my website. I go to the VideoPress icon, click it and I get a log in box. I enter my WP log in info and then I get this error message:

ERROR: Invalid username. Lost your password?

I do not know why I am getting this error message. I am logging in under my user name/password.

Has anyone else experienced this error message?

Thank you.

Julie