You will initially create a Substack Account at this Substack link. Write a blog and post it. Copy the URL link for that blog on Substack and copy that Substack link to a hyperlink that you create on this page. Sample: How to raise a Dragon properly. That is a fake blog with a fake link. Once you get a list of blog options that you have posted, you may want to put the main link to your Substact account so the viewer can browse what you have posted.
How to create a link in Google Sites to your Substack article. Click on the Link Icon, which looks like a paperclip, located next to the A in the above text box. It will bring up a small box with a space to paste the URL from your Substact article into it. Above that, it will show Text, type in the name of the article and hit apply. If you need a video to do this go to the ABC Dome Vault for a lesson on how to create a hyperlink on a Google Sites page.
Once you are comfortable with this process. Delete all the instructions.