Make sure you have a good reason for the check. It will only be accepted to counter vandalism or disruption to Wikimedia wikis. Valid reasons include needing a block of the underlying IP or IP range, disruptive sockpuppetry, vote-stacking, and similar disruption where the technical evidence from running a check would prevent or reduce further disruption.
Be specific in your reasons. Ambiguous or insufficient reasons will cause delays. Explain the disruption and why you believe the accounts are related, ideally using diff links or other evidence.
Make sure there are no local checkusers or policies.
Reason(s): It appears that the first user creates the two others users for persistent vandalism of the page ET1. But they thing that me and the other user with the name Jeanis 12345, we are pupet accounts and control us the user Γιουγκοσλαβια. Please, do the checkuser so prove that we don't have any relationship. Timmy terner (talk) 13:36, 1 July 2015 (UTC)