Friends on Pixiv
Now that you have a pixiv account, you may want to share it with your friends. A great way to do this is making some! If you want to add someone as a friend on pixiv, first go to their page. There are two ways to add a friend once you're on their page, both options are circled below:
From there you will be taken to a page where you may make your request.
And now your request is on the way to your soon to be friend.
If someone sends a request to be your friend, a message in red letters will appear on the main page: マイピク追加リクエストが 1件 あります Click on that and you'll go to the main mailbox. Click the subject line of the message in your box and you'll see this:
The next page will allow you to respond to their message. Hopefully with something happy like, "It's great to have you as my friend!" and not something like, "I only accepted you because I had to." The send button is the longer one.