Allied Telesis AT-S63 - Manual (Page 350)

Chapter 21: Port-based and Tagged VLANs
350 Secton V: Virtual LANs
7. Click Apply.
Note
Any untagged ports that you assign to the new VLAN are
automatically removed from their current untagged VLAN
assignment.
The new user-configured VLAN is now ready for network operations.
8. From the Configuration menu, select the Save Config option to
permanently save your changes. (This option is not displayed if there
are no changes to save.)