Addıng a hyperlink

Hello, I am designing a planner for the sale of etsy. My designs work smoothly in pdf format, but I need to make a few edits. I combined different pdfs and I need to add bridges between them. When I searched the internet, I saw that it can be done in this application and I made an in-app purchase, but I can't find the option to add this bridge and I can't use it. I use the application on Ipad 4th generation tablet and andorid phone.  The issue is very important to me to sell my design, I expect help from you as soon as possible, thank you.