This article will take you step by step through the process of adding a contact form widget to a single content page; however, this same process can be used to add almost any type of widget to a single content page.
Too Long; Didn't Read
To add a widget to a single content page, add a new widget in Themes > Edit Theme > Content Page (Base), enable the merge code on the widget, then copy and paste the widget's merge code into the content page in Content > Pages > Edit Content Page.
Step 1: Create a Contact Form
You will first want to create the contact form. Its a fairly straightforward process.
Step 2: Add Widget to Content Page (Base)
Go to Themes > Edit your theme > Content Page (Base) > Widgets and click Add Widget, then select Contact Form Widget. Immediately after creating it, edit the widget and make sure to check on the Enable Merge Code option:
Anything added to Content Page (Base) will display on every content page. This is because it is the base for all content pages. This makes it really easy to make changes to all content pages at once. This is why we must enable merge code when we want to display a widget on a single content page. Enabling merge code will cause the widget to only be displayed where the merge code is pasted.
Step 3: Copy and Paste Widget Merge Code onto Content Page>
Once you have the widget's merge code, navigate to Content > Pages, and edit the content page you would like to have this form display on, then copy and paste the widget's merge code into the Page Content of the content page: 