Hello there 
Step #1:
Navigate your browser to https://steamid.pro/ or alternatively any other site similar. We recommend you use that one that we posted above.
Step #2:
You can either use your web browser or the Steam desktop application for this, you'll need to open your steam profile. If you're using your web browser you can copy the link from the address bar or if you're using the Steam desktop client, you can right click on your profile and "Copy Page URL". Enter the address you've received into the search bar on the website and hit the search icon or enter.
Step #3:
On the next page after hitting the search button you will see a some information about your Steam account. The only information that is needed from the page is under the Steam3 ID (64bit) table. You will extract the part on the right side which says (Hex) and place it into the necessary spots that require your Steam hex.
Step #1:
Navigate your browser to https://steamid.pro/ or alternatively any other site similar. We recommend you use that one that we posted above.
Step #2:
You can either use your web browser or the Steam desktop application for this, you'll need to open your steam profile. If you're using your web browser you can copy the link from the address bar or if you're using the Steam desktop client, you can right click on your profile and "Copy Page URL". Enter the address you've received into the search bar on the website and hit the search icon or enter.
Step #3:
On the next page after hitting the search button you will see a some information about your Steam account. The only information that is needed from the page is under the Steam3 ID (64bit) table. You will extract the part on the right side which says (Hex) and place it into the necessary spots that require your Steam hex.