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Thank you! I'll write a more detailed explanation here if you don't mind:
1) Go to the editor (game folder/bin/editor.exe).
2) Create a new map.
3) From the left column, we choose to create a hero (select HERO; you can choose either scripted or regular heroes, but regular heroes don't have one hero per faction, but rather one hero for the entire faction) and place it anywhere on the map.
4) In the left column, switch to something else so that you can select the hero you created.
5) Press the spacebar (after selecting the hero).
6) In the main tab, select the desired hero.
7) Since I had the name in Russian, and if you do too, go to the settings tab, and the name will be there (it's called "spells name" or something similar).
For example, Lucretia - Tamika.
So don't be surprised by the names :)
THANK YOU FOR YOUR HELP!