There is a Steve texture in the texture editor. There is currently no Alex texture available in the LearnToMod texture editor, which may change in the future. For now, users may edit the Steve texture in whatever way is perferred (Black Widow? Ironman? Were-steve? Your choice.)
If you would like to upload the skin you created on the LTM editor texture to a different Minecraft server, here is how to upload skins to your minecraft account: https://minecraft.gamepedia.com/Skin#Changing_.2F_installing_player_skins
If your default character in Minecraft is Alex, you may need to change it to Steve when using the skin.