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To become an admin, you will need your SteamID64.
You can obtain it here: https://steamid.io
In Basic Mode, you enter your SteamID64 under Admin Settings.
Then click on Save and restart the server.
In Advanced Mode, the SteamID64 is entered in the SpaceEngineers-Dedicated.cfg file.
Find the following line: <Administrators>
.
Insert your SteamID64 between these tags: <unsignedLong>Steam64ID</unsignedLong>
Replace Steam64ID with your SteamID.
It should look like this:
<Administrators>
<unsignedLong>76561197979226165</unsignedLong>
</Administrators>
You can also add more than one admin:
<Administrators>
<unsignedLong>Steam64ID_1</unsignedLong>
<unsignedLong>Steam64ID_2</unsignedLong>
<unsignedLong>Steam64ID_3</unsignedLong>
<unsignedLong>Steam64ID_4</unsignedLong>
<unsignedLong>Steam64ID_5</unsignedLong>
</Administrators>
Click on Save and restart the server.