In general, the SCP-826 test log isn't a particular strict one, but there are some guidelines to consider.
First and foremost, this isn't just "shoutout to my favorite fandom". When contributing to the log, there should be at least some depth to your contribution. Try exploring the story, seeing how to alter it, and do something new here. Every entry should add something interesting that people will enjoy reading, even if only for a short moment.
An example of how not to do it.
Head Researcher: Dr. Selfinsert
Subject: Agent Bestfriend
Material: Harry Potter and the Sorcerer's Stone by J. K. Rowling
Equipment: One hidden body camera.
Results: Upon entry, subject found himself in the library at Hogwarts Castle. Subject befriended Harry, Ron, and Hermione and begin helping them with their studies. Eventually, subject left them and found the affected copy of the book on a nearby bookshelf.
Addendum: That's my favorite book! - Dr. Selfinsert
Additionally, remember that this is still a Foundation document. Clinical tone and proper spelling/grammar is a must. Try and maintain some level of professionalism as well; don't turn this into researchers using it for dumb jokes.
Another example of how not to do it.
Head Researcher: Dr. Jojoreference
Subject: D-69420 nice
Material: Fifty Shades of Grey by E. L. James
Equipment: One head-mounted camera, two bottles of wine, one [REDACTED]
Results: [DATA EXPUNGED].
Addendum 1: Haha nice. - Dr. Jojoreference
Finally, stick to the actual rules. SCP-826 has specific properties, and while it's cool to test the extent of those properties, don't alter it radically for no good reason.
Yet another example of how not to do it.
Head Researcher: Dr. Jack Bright
Subject: Agent Keanuchungus
Material: The Emoji Movie
Equipment: One head-mounted camera, one assault rifle.
Results: Subject attempted to enter the room, but the movie was so cringey for SCP-826 that it ended up summoning a giant dragon to destroy everyone in the Emoji Movie to get rid of the cringe.
Addendum 1: Further testing with unpopular films is advised, as to determine whether or not SCP-826 displays any other anomalous properties.
Addendum 2: Let's just get every copy of that film and give it to 826, it's doing us all a favor. - Dr. Jack Bright