Some of the pages in QuickBooks Online (QBO) aren't accessible when using mobile browsers. This is because the whole page doesn't fit the mobile screen. In this case, you'll need to sign in to your QBO account using your computer's browser so you can enter your employee's timesheet. Here's how:
Sign in to your QBO account using your computer's browser.
Click the + New button, then select Single time activity or Weekly Timesheet.