Dear developer, 
I could not find step by step instructions on how to remove the watermark after the donation to the developer: 
1. How do I confirm my donation? 
2. How do I get an donation key after the donation? 
3. how to insert the donation key? 
4. What to do with a key that pops up after the start of the system? 
Create, please, instructions and place in the subject header.