I have contributed to a SEP 401k where do I claim this Is it considered an IRA

No.  A SEP is not an IRA. 

Click on Tax Tools on the left side of the program screen. Click on Tools. Click on Topic Search. Type in self-employed retirement. With the key words highlighted, click on GO.

There is no such thing as a "SEP 401(k)."  It's either a SEP IRA (which is a type of traditional IRA that you would contribute to from net profit from self-employment, a SIMPLE 401(k) (which is not an IRA) or a regular 401(k) (which is also not an IRA).  An individual 401(k) that you contribute to from net profit from self-employment is a type of regular 401(k).

If your contributions are reported in box 12 of your W-2, enter the box 12 amounts only in box 12 of TurboTax's W-2 form, nowhere else in TurboTax.