HI THERE! IVE BEEN DOING A LOT OF RESEARCH AND CANNOT FIND AN ANSWER. MY QUESTION IS, HOW DO YOU ADD YOUR BUSINESS' LOGO TO YOUR CAKE'S PHOTOS? WHAT APPLICATION DO YOU USE? 

ANY INPUTS WILL BE GREATLY APPRECIATED :)

I use Adobe Lightroom, but I pay for it monthly as I dabble in photography. I’m sure there must be another program you can use

I use iWatermark, it’s an app for iPhones 

I use PicMonkey.  Many of the functions are free, and I believe you would be able to add your logo without a paid subscription.  However, if you do many photos, full access to the site is well worth the minimal cost.

https://www.picmonkey.com/photo-editor?gclid=Cj0KCQiAiKrUBRD6ARIsADS2OLmc_ZQNLfUqWCDjbK_LnjZODyZEP9aMNyfr1bzmA8ojsSRsxHSyBnEaAkPhEALw_wcB