Sign in to SelluSeller, click in the upper-right corner on any page and then click Configurations.
The Configurations page appears with the Fulfillment Management tab by default.
Enter your FBA credentials (API Key, Signature Key, and Email ID) and click Sync Account. Your SelluSeller account is instantly synced with your fulfillment account. After syncing, all your fulfillment account data is immediately available in your SelluSeller account.