Your RSN is your save name, and it's how the guide finds your RuneLite level-up screenshots (.runelite/screenshots/<RSN>). Use the same name to carry on where you left off.
Hardcore Main Guide
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Save code
Your save code
Copy this somewhere safe. Paste it back in (here or on the login screen) to restore this save in any browser.
Load a save code
Paste a code below. It's restored under the name stored in the code and opened.
Levels from RuneLite
Link your levels?
You've just levelled Thieving, so RuneLite has now made your screenshots folder (.runelite/screenshots/<RSN>). Link it and the guide ticks level requirements off by itself and warns you before you hit one you're missing.
Needs RuneLite's Screenshot plugin with Levels (and Quests) turned on.