Hello aelliscleaningse,
QuickBooks Online as many features to automate processes for entering and creating transactions, but there are still many ways to enter your data manually. I'd be happy to go over manually entering a receipt into the program with you.
Whether you mean you'd like to enter a sales receipt from a sale or an expense receipt from a purchase, QuickBooks Online has ways you can enter this data manually. I've pulled two articles from the QuickBooks Community that can help you with these processes, which you can bookmark, too, if you'd like.
There's also the opportunity to manually add attachments to these kinds of transactions. For instance, if you have an expense and you'd like to include a copy of the physical receipt, you can use the attachments field to ensure it's included. Here's how that works: Attachments in QuickBooks Online
That information should get you started, but don't hesitate to let me know if that's not quite what you're looking for. Simply respond with more detail and I'll help you get on track with manually creating receipts.
Take care!