You can invite your friends with or without uSchoolnet account with a few simple steps.
Step 1. After entering your blog, click on Manage My Blog button.
Step 2. From the menu on the left, you can see there are 3 options in pink on the very top, click on the first one Do it with friends.
Step 3. Another window will pop up once you click Do it with friends, just follow the instructions to send invitations to your friends.