Step 1: 

-Head over to OMNA Setting tab, and click on "Shopee".

Step 2:

-Select your Shopify Stock Location that you would want to sync your Shopee product inventory with. 

Step 3:

-Press "Enable". You would be redirected to Shopee Open Platform for authorisation

Step 4:

-Select your country

-Fill up your Shopee seller credentials. Click on "Login". Press "Yes" to authorise OMNA. You would be redirected back to OMNA

If you see the message "Is already enabled", Congratulations! You have successfully linked your Shopee account with OMNA. 

Fill up the default properties which would be used for your product listing.

Now you can start to list your Shopify products on Shopee