Enter the 24 recovery words from the sheet, or two of the three trusted-contact cards. This page works out the key here in your browser, finds the encrypted copies made with it on Arweave, and opens the one you choose. The words never leave this page.
I have the Arweave item id
Files
Without Pith: the recovery sheet explains how the key and the copy are built, so any programmer can open it from Arweave directly.