Hi Kim! Just got back late last night from a three-day backpack trip. I’ll help you sort this out.
On the Six-Pack of Peaks menu above, hover over The Challenge and you’ll see a Log your hike option. This takes you here: https://socalhiker.net//enter-your-six-pack-of-peaks-hike/
Note that you must first be registered and logged in — only registered Six-Pack challengers have access to log there hikes.
If all goes well, you should see a screen similar to this:
If not, please let me know.