cant get my number to change from email to my phone number I am need ing to know how I can use my cell phone number to send and recieve messages instead of my email address. 

When I go to my settings to change it my number is in grey and my email address is in black and I am needing to know how I can fix that?
Even though the line is greyed out, the checkbox next to your phone number in Settings > Messages indicates it is being used for sending and receiving messages. The email address(es) listed indicate that iMessage also looks for iMessages sent to those address(es), and will deliver them as if they were sent to your phone number (so long as each one has a checkmark next to it as well).