This program exports your current account settings and saves them to a file. Saved files can be uploaded to the server!
Extract the zip archive and open your directory in file explorer.
Login to your Valorant Account (you don't have to start the game - starting the client and logging in is enough) and replace your file-explorers path with cmd and press enter.
For people with less experience:
Your current path should look similar to Your Computer (or Computer) > Downloads > valorant-explorer - simply click the white / empty area and remove the whole path and replace it with cmd.
Now write following command to start the exporter.
.\valorant-exporter.exe
All further steps are self explanatory.
Have fun and wish you a great day! :^)