BLOGS- You can't tag someone in a blog, but you can tag someone in the first comment on the blog.
PHOTOS- Click to open the photo you want to tag. Under the photo on the right, it says "Tag This Photo". Click anywhere on the photo itself, and type in your friend's name. You can also click to tag the photo as yourself.
POSTS & COMMENTS- To tag someone, post @ and then start typing their name. They should pop up to be tagged. If you have apostrophes in your post, it will show some messed up coding. Don't panic, this fixes itself once "share" or "comment" is clicked.
If the names don't pop up to tag, there are a few explanations/options.
Check with them to make sure they have their privacy settings set to allow tagging. See if they have funky characters in their name, which can mess with the tagging system.
Two, make sure you are actually friends or that the person you are trying to tag is a member of the group/page if you're attempting to tag in a group or page.
Copy what you were writing, and refresh the browser window. Then try adding the tag again, typing their name slower. As we cache up to 500 names at a time, sometimes it can take a few moments to register it.
If worse comes to worst, there is a “hack” for this. When you can tag someone, you'll see an [x=] followed by a number, their name, and then a closing [x]. Copy that in notepad or something, then go to their profile and in the address bar, simply add THEIR user ID number in. If they're using a vanity URL or you're posting a blog, this obviously won't work, but it's a hack, nonetheless. (For blogs, just tag them in the 1st comment) I've seen groups actually make a blog in the private page with all of their member's user ID numbers in it, so people can use this hack when the tagging goes a bit wonky.
For example, if I can tag Jane Doe, I get this-
Going to John Doe's profile, I see his address is roleplaylives.net/profile-1349.
Then, I simply re-write that coding to say[x=1349]John Doe[/x]