Step 1: 

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

Step 2: 

-Configure your stock location from the drop-down lists. 

Step 3:

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

Step 4: 

-Sign in to your relevant account and authorise permission

If you see the message "Is already enabled", Congratulations! You have successfully linked your Lazada 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 Lazada.