Ways to connect 14 AWG to small PCB solder tabs
Those tabs are designed to have wires soldered directly to them. Trim the insulation so that it comes to the end of the board and the wire overlaps the entire pad. Pre-tin the pad and the wire and just melt the wire into place.

The two circular holes at the one end are for the XT60 connector which you will find on many LiPo batteries.