On iPad, while viewing a document, you should see a blue button. Tap the button and choose "Fill & Sign". There should be the signature menu item in the top toolbar. If you have an already synched signature, it will appear on choosing the signature option, otherwise you will have an option to create a new one. Let us know if you face difficulties with it.

Thanks.

On Windows something was strange and not sure it was relatera to Acrobat or the OS? In the drop down where you add remove or change the signature, blue “+” or ”-“ it was just blank. Somehow, after restarting logging on and off, changing accounts, reinstalling on same pc it suddenly worked. But I still can’t change my signature on my iPad. There are no options for it that I can find. Am I doing something wrong or is the feature removed? How can I sync the added signatures to all my devices/ pc’s?

Can you please share more about what you are trying to do? In recent releases, we've moved the signature capability underneath the "Fill & Sign" tool. This can be found by tapping on the blue "+" button when viewing a pdf document. If you are seeing this and something isn't working, it would help to know more about the things that you are trying.