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手帳に

in a planner or notebook

→ 手帳
phrase Rare #37,580
in a planner or notebook 手帳 means a personal planner, organizer, or small notebook. に marks the place where something is written or recorded.
JA: 大事な予定を手帳に書いておきました。
EN: I wrote the important appointments in my planner.

手帳に書いたのだ

I wrote it down in my planner.

— インディ・ジョーンズ／最後の聖戦 (1989)

ジムは手帳に何か書き始めた。

Jim started writing something in his notebook.

手帳にお名前を書いていただけませんか。

Could you please write your name in my planner?

トムはメアリーの電話番号を彼の秘密の手帳に書き留めた。

Tom wrote Mary’s phone number down in his secret notebook.