I will explain it to you and you'll see why it's not suitable for the general public.
Once you've settled on your fonts, you merge those two text layers together into one pixel layer. Then you hit the "Fx" button and choose "Color Overlay". Choose a colour - any colour, it doesn't matter - for the text to be.
Then you delete all your unused layers, including the black Solid Color layer you're using as a background at the moment. You just want the text and flower against a transparent background. Then go to Edit>Trim to trim away the excess space. Save that as a different PSD file, ready to use.
Then you open up the photo you want to put it on. Go to File>Place Embedded, and choose your logo file. It will appear on your photo, and of course you can size it and position it however you want.
Then it's time to change the text colour for your exact needs. You go to Layer>Smart Object>Edit Contents. This will open the file in a separate tab, where you can double-click the "Color Overlay" in the layers panel, choose your desired colour, then save and close that file. When you return to your photo file, the new colour will be there.
This probably doesn't make sense as you read it, but it will when you do it.