The Goal

1. Add IK Bone

- Select the highlighted bone tail ⬆️

- Select “cursor to selected” ⬆️

- Shift + A to add a new bone then adjust it length ⬆️

- Change the bone name ⬆️

- This is what we have now ⬆️
2. Add IK Constraint

- In Pose Mode, select the bone_front3 to add a bone constraint ⬆️