First, click to Edit your Google Site webpage.
Then, on the right-hand menu under "Insert", select "Embed".
Next, select the "Embed code" option on the "Embed from the web" box that appears.
Then, copy and paste the following into the text area, substituting in your giving form link for the "src" attribute:
<iframe src="https://secure.egsnetwork.com/donate/F4C37A933AE6497" title="Giving Form" height="2200" style="display: block; border: none; width: 100%;"></iframe>
Then click “Next”.
Next, click the "Insert" button. Your form is now embedded on your Google Site webpage.
After the embedded form is show on your page then you can change the size using the blue dots. You’ll want to make sure you expand the box long enough so as the form expands the donor is able to see the entire form.