Step 1: Click here to sign in your Wix account.
Step 2: Click Add App button on the top right corner.
Note: You will be redirected to App Market
Step 3: Once you redirected to App Market, on the upper left corner click My Apps.
Step 4: Click the Upgrade button on the right side of your Social Media Stream app.
Step 5: Enter your payment details.
Step 6: Click Submit Purchase button.