1. Log into your Facebook account. Please refer this link to create a Facebook Page if you have not created one (Steps to create a Facebook Page).
2. Click on the Admin link given in the mail, which you have received from ZEPO.
3. Click Ok
4. Again, Click Ok (give full authorization)
5. Click Ok
6.Enter access token
7. Select your FB page from the drop down list; enter the name of your store which you want to be shown on your FB page and save changes. Please refer this link if you are not able to see your page in the drop-down list (Not able to select my Facebook Page in the Drop-down List)
8. Click on 'Visit your Facebook store'
9. Your FB store is integrated on your FB page.