There are several ways to add a form to a Glow Blogs site.

Jetpack

Jetpack has a contact form module that is very full featured. In Glow Blogs it only works in pages or posts edited with the classic editor.

To add a contact form you need to have activated the Contact Form module in Jetpack, then just click on the Add Contact Form Button, remember to set an email to receive the information.

The Jetpack form has lots of features, different fields radio button & checkboxes. It also will email the results to addresses set in the editor & keep them in your dashboard.

If you are using the block editor to edit pages & posts you need to edit a page or posts in the classic editor to add and edit a jetpack form. You can allow users to switch editors in the Dashboard-> Settings -> Writing.

Contact Form Block

If you are using a block theme you can also use the contact form block plugin.

You need to activate the plugin first.

This is a very simple form. It will e-mail the Administration Email Address as set in the Settings-> General section of the dashboard.

The form allows visitors to send a message with a name & email.

There is an example form and more information on the Blocks blog: Contact Form Block.

This form does not work with a classic theme.

Other way of gathering feedback.

You can embed Google Forms, links to O365 forms or even use comments.