Text fonts and Stamps Brush

How to I add fonts on text? Because I want to add fonts on my text fonts with saints websites

https://www.dafont.com/ . And how do I add stamps on on Adobe Fresco? I watch the video that said I need to use an eyedrop on the image with multicolor mode, but the thing is..I don't have multicolor mode to make stamps?? I do you guys add stamps in Adobe Fresco?