If you have investment losses in your Roth IRA can you deduct those? if so where do you enter in that information?

No, you can't deduct losses in a Roth IRA, or a traditional IRA. 

Prior to the 2017 Tax Cuts and Jobs Act, you could deduct losses in an IRA, if the account was fully distributed (empty). Even that narrow deduction is no longer allowed. Click here for more information.