What version of Photoshop Elements and Premiere Elements? What computer operating system? What did you purchase - download or boxed packaging with installation discs?
Why are you saying that you have the Premiere Elements tryout? After you go through the installation, Sign In, are you getting a tryout dialog? If so, at the bottom right of that dialog, there should be two buttons - one for License this Product and the other Continue Trial. If that is the case, select License this product and follow the instructions which will include inserting your purchased serial number. Do you have the purchased serial number for Premiere Elements?
Contact Amazon as rapidly as possible if problem cannot be resolved.
Since you purchased from Amazon, it is the only one who can decide on your return/refund/exchange opportunities.
Please consider, supply details (see note below), and then we will decide what next.
This is a public forum (user to user) so do not post serial numbers, purchase order numbers, or any other personal information here. This is not Adobe.