How do I use TP-Link parental controls when I am using the router as a WDS bridge?

My ISP provided a router but it does not provide an admin panel with any useful settings other than letting me change the SSID and password. I bought my own router, a TP-Link TL-WR940N which I wirelessly connected to my ISP routers using the TP-Link's WDS feature. I've connected my children's device to the TP-Link in the hopes that the Parental Controls on the TP-Link would work on my children's devices. However, they are not working and the children are still able to access all website at all times. Is there another way to both use WDS bridging AND use the router's parental controls?

Question by CodyBugstein on Super User, licensed CC BY-SA. We show a short excerpt and link to the original thread as credit.