Yes you can!
Here's how to use your Online Offers from a desktop/laptop:
1. After tapping "Online Offers" and selecting the offer you like just tap "Save Offer to my list".
2. Tap "My offers".
3. Send yourself a link to the offer by tapping "Shop on desktop" and choose how you want to send yourself the link.
4. Copy the received link into your browser address tab and click "Get Offer". The link will be active for only 24 hours so make sure you finish your shopping within that time
Only by using these links will the funds then be added to your ZIPZERO wallet. After 24 hours you will need to send yourself a new link to use the offer.