You can embed a forum into your Blogger website by getting your forum embed code and then following these instructions to insert the embed code into your blogger website:

Step 1: Get your embed code

1. Log in to your Website Toolbox account.
2. Click the Integrate link in the main menu.
3. Click the Embed link.
4. Click the Embed your forum link.
5. If a Create A Subdomain First button appears, click it to connect your forum to your website domain so that it remains embedded when accessed from the Safari browser, or click Get Embed Code to come back to this step later.
6. Click Get Embed Code and copy the embed code to your clipboard.

Step 2: Add the embed code to your website

Once you have the embed code, you can add it to your website by following the steps below.

1. Visit Blogger.com
2. Log in to your account.
3. Click Pages
4. Click + icon at the bottom to create a New page
5. Next to Page, type in the name of the new page. For example, Forum.
6. Add your forum embed code in the text box below.
7. Click Save icon.
8. Click Publish.
9. Click Layout.
10. Click the Pencil icon under the Page List (Top).
11. Check the check box next to Forum.
12. Click Save.
13. View your blogger website. A Forum link will now appear in the navigation of your website. Clicking that will open a page with your forum embedded in it.