See Access SEFOS Interface Configuration Mode.
For example, to access SEFOS Interface Configuration mode for port 2:
SEFOS(config)# interface gigabitethernet 0/2 SEFOS(config-if)#
SEFOS(config-if)# switchport access vlan VLAN-ID
where VLAN-ID is the number of the VLAN (1 - 4094).
For example, to add port 2 to the VLAN with ID 13, type:
SEFOS(config-if)# switchport access vlan 13 SEFOS(config-if)#
SEFOS(config-if)# exit SEFOS(config)#