Unable to link to a Confluence page in iPad or iPhone

The user is using iPad Pro to use Jira/Confluence via Safari (no the App isn't an alternative). In a ticket, he wants to add a link to a Confluence page. But he is not able to enter text to search for a page, because the control doesn't accept the click on the input box. So he doesn't get the cursor into this input box and cannot search for a page.