When putting in income do I round up? It says invalid number when I try to put the "Cents" in.

Ara you entering a comma instead of a decimal point?

Exactly where  won't it let you type the amount with the cents?  Like what box on the W2?

Yes, you can round off cents to whole dollars on your return and schedules.  You will need to round up or down as it applies. To round, drop amounts under 50 cents and increase amounts from 50 to 99 cents to the next dollar. For example, $1.39 becomes $1 and $2.50 becomes $3.

See the following IRS link for more information (under Computations): https://www.irs.gov/publications/p17/ch01.html