This one is pretty straight forward, just create a nether portal frame ensuring all sides are completed and light it just like any other Nether Portal
Configuration
# Any material in this list will be considered a portal frame materialportal-frame-materials: - "minecraft:obsidian" - "minecraft:crying_obsidian"size:# Minimum number of portals block spaces required to create a valid portalmin-portal-blocks:6# How wide the portal can be. Larger numbers may cause issuesmax-portal-width:23# How tall the portal can be. Larger numbers may cause issuesmax-portal-height:23