@sngma2 Yes, you can. You just have to daisy-chain the two switches:

@Jeroen74 When the router is with its factory default settings you have to set its password on the first login (user guide - Chapter 3): "Visit http://tplinkwifi.net, and create a login password for...

@pioche If you move PC2 to the Switch_1 where the PC1 is you should be able to achieve this. But In this topology PC2 and PC3 won't see each other because they won't be on the same subnet anymore.

@FaustoSchiavone Your problem is that RE450 v3 doesn't support OneMesh feature. It is supported on RE450 v4 and above - details.

@fogroach Usually the MAC address of the router is printed on its bottom sticker. Check your old router bottom sticker for its MAC address.

@Parkway Try here: