Services -> Services
"Static Leases"
Fill out an empty line:
MAC Address | Host Name | IP Address |
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Those first 3 fields are mandatory, if you miss it then the changes will be lost even if you try to save.
Make sure you've done it right but clicking "Save" and then "Apply Changes" at the bottom to make them active.
Then get a new DHCP lease and make sure the IP is correct.
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