Please elaborate your issue. If you need help with creating PDF files using Acrobat Reader mobile app, then follow the steps mentioned below.
Open Acrobat Reader on your device.
Tap on the Home icon in red on top left side.
From the tool set tap on Create PDF.
From here, tap on grey + sign in the square box.
Select the document which you would like to convert to PDF.
Tap on blue Convert button to convert the selected file to PDF.
(You need internet connection to perform this)
Once the file is converted it will show under Recently Converted Files list just below.
Tap on the file to open.
You need to have a paid subscription for the conversion process.
Let me know if this help.