I apologize for not being clear enough about what exactly I'd like you to screencap next.
If you click on the name of the UTAU, it will open the Project Configurations window.
In this example I'm using Defoko's voicebank, so if you've got another UTAU in use the name will be different. Please click on the name of the UTAU voicebank, highlighted for you with a red square.
This will open a small window called
Project Configurations. You'll also notice you see this window every single time you start a new UTAU project.
I've highlighted two different things for you in this next screencap. If you're trying to change the resampler (shown with a
red square), you need to click the little box next to it (shown with the
blue square) and find the .exe. There are some resamplers that require you to change the wavtool as well, but usually that isn't the case.
Please let me know what happens once you've changed this.