@christie28 , welcome to the Ibotta community forum! On the bottom of your home page, go to “redeem”. From there you pick the Walgreens in-store logo (assuming you have a physical receipt from shopping in-store or doing in-store pickup) then you can take pictures of your receipt and submit.
Scanning of receipts can only be done from the Ibotta app.
The Ibotta app runs on a smartphone or a tablet. You can also use an older phone that does not have cell service. You will need wifi service, though.
I have heard that there are several android emulators available for PCs. You MAY be able to get the Ibotta app to run under one of these emulators, but I have never tried.
Please check this link for what devices Ibotta supports: