I am unsure whether I need another TL-PA4010 or the WPA4220. I'm 85 so am a tad slow.....Also, I am finding it difficult to purchase the item in question, Anyone help me please????

I am having problems with pairing my TL-PA4010(UK) ver 3 with my TL-WPA4220(UK) ver. 4. I have followed the relevant instruction sheet, but I still end up with 2 networks of Wi-Fi, one for the Adapter