Okay, first create a user group called "one year" (no quotes)
Now, in your Admin CP > Usergroups > Promotions click Add Promotion.
Usergroup: Registered Users
Reputation Comparison Type: Greater or Equal to Less Than
Reputation Level: 0
Days Registered: 365
Posts: 0
Promotion Strategy: Join Date
Promotion Type: Additional Usergroups
Move User to Usergroup: one year
(Note: I have never used the above setup so I can't promise it's correct but it looks right, maybe somone who's worked with it can confirm for us)
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Now let's add a conditional for the new "one year" group so it will show up under their avatar, take not of this groups ID in the Usergroup Manager.
In you postbit (or postbit legacy) find:
Code:
<if condition="$show['avatar']">
<div class="smallfont">
<br /><a href="member.php?$session[sessionurl]u=$post[userid]"><img src="$avatarurl" alt="<phrase 1="$post[username]">$vbphrase[xs_avatar]</phrase>" border="0" /></a>
</div>
</if>
Add under: (be sure to change the number 6 in this example, to your "one year" group ID number)
Code:
<if condition="is_member_of($post, 6)">
insert your special image or text in here
</if>