On Set Delivery Address page.
Refer [login to view URL]
1. New field below address - Set this field as mandatory, to allow app user to type in their address.
2. Phone No. - Set limit digit to 11
3. Notes - Current mandatory, require to set it to optional (not mandatory)
On Add On page.
Refer image [login to view URL]
1. Free Add On / Paid Add On - Existing field doesn't fit all the words.
Require to create more space for more words. To show more character.
I have looked your requirements and I can do very quick with better quality I have more than 4 years experience in iOS development. Please chat with me for more details