This screen allows you to enter the proficiencies of your character.
Nbr of slots selected: This is the number of proficiency slots you already chose for your character.
Nbr of free slots: This is the number of free proficiency slots you can use.
Non-weapon proficiency: This is the total number of non-weapon proficiency slots you can use.
Non-weapon #Levels: This tells you after how many levels you will gain another proficiency slot. For example: a fighter gains a new non-weapon proficiency after 3 levels
Weapon proficiency: This is the number of weapon proficiency you can use
Weapon proficiency penalty: This is the penalty you have when your character uses a weapon he is not proficient with.
Group crossover: This tells you what category of proficiency your character can choose from.
Example: Fighter: 1,4 means that your character can choose from General and Fighter category.