Configure ShinraMeter to upload endgame boss encounters to the OSTO Leaderboards.
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You will need to have an OSTO account and ShinraMeter installed. Download ShinraMeter here: https://oldschool.to/download
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Navigate to your OSTO Account Settings: https://oldschool.to/account#security
Under the API Authorization card ****in the Security & API tab, copy your API Key:

OSTO Account Settings
Open your ShinraMeter settings by expanding the hidden icons tab on your taskbar and clicking on the ShinraMeter icon., then click on Server Settings.

Paste your OSTO API key into the Auth Token field.
Type your OSTO username in the Username field.

ShinraMeter Server configuration interface
ShinraMeter will now automatically upload boss and BAM encounters to OSTO!
To check which bosses and BAMs currently have upload support, please refer to the following page: