When signing to submit tax return it will not allow because does not recognize my first name ????

for an e-filed return, no signature is required. if you are mailing it, print then sign.

Did you return to the MY INFO tab and edit your information to review exactly what you entered ?   If you entered so much as a space it will not match ... I would delete the first name and re enter it again.   Then try efiling again in the FILE tab.