Import and export save data for http://melvoridle.com/
Using the Melvor Idle sidebar, click on Settings, scroll down and click 'Import / Export Save' and copy your exported save
Paste this into the first textbox (1. Import)
If valid, the second textbox (2. Edit) should now be editable and have a human-readable version of your save
Simply change your save in this textbox, the third textbox (3. Export) will automatically update with your new copiable save if still valid