[daplunk]

If you see a monster that is going to need to carry a weapon or wear armour we need to add proficiency to use that item. With monsters you can add specific proficiency to use specific weapons and armour. I'm not a fan of this as Hero Lab lets you change weapons and armour so easily so best to make the monsters capable of using other stuff.

The monster I'm making can use a Longsword and a Jevelin. Longsword is a Martial Melee Weapon while Javelin is a Simple Melee Weapon. Thus I will add Martial Weapon Proficiency as it is higher.

To do this locate the monster in Race > Race > Monster Name

Tick the option you want them to have (Martial Weapons) and click OK > OK > Test Now! to apply the changes.

Now the monster can pick the weapons within Hero Lab and will be proficient in them.