Limit bandwidth using MAC in 21.02.3 version

Hello everybody.

Well, first I have to say that I'm new to OpenWRT. I understand a little bit.

I'm currently using version 21.02.3 on an X86 MiniPC with ProxMox.

Unfortunately my knowledge of Linux is zero. A friend installed everything for me.

I wanted to do something simple, limit my LAN's bandwidth while the Access Point's bandwidth remains full.

I saw that in version 22 there is something called nftables, but it is incompatible with my version.

Does anyone know if there is an easy way, through OpenWRT's own interface, that a novice can control the bandwidth of devices individually?