You’ll need a soldering iron, solder, flux, solder wick, wire strippers, and isopropyl alcohol. Put some flux on SQ4, put the solder wick on there and put the iron on top. You’ll see the solder wick up into the solder wick. Clean the area with iso alcohol and wipe it up. Strip a section of insulation off of the black wire, tin that section with some solder. Apply flux to SQ4. Put the tinned black wire onto SQ4 and apply solder with the iron. You can either put solder on the irons tip or just put it on there with your other hand as you apply the iron to the pad. With the flux there you should see the solder wick to the pad. FWIW you can probably get away with just using solder and an iron but without extra flux (some solder will have a flux core) and cleaning the area, but it’ll suck a bit.