Follow the below mentioned steps to allowcustomers to enter additional info on order form in WHMCS.

Step::1 Login to your WHMCS.

Step::2 Hover over the Setup section and click on General settings.

Step::3 Now in the next step jump over to the Ordering tab.

Step::4 Scroll below and find “Allow notes on Checkout” option. Tick to enable.

Step::5 Click on Save changes.

That's It !
Check out the video tutorial on the related topic.Read the blog as well.
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