Howto select mirror for download with discover?

[Inseismail]

Hi all,

I have a terrible slow connection with discover if i try to download something with max 330 kib/s. If i download outside of it i have a speed around 2,4mb/s. Is it possible to configure the settings of discover for fast mirrors? I cant fin any setting if this is possible.
In settings of discover i only have firmware update with 3 options to choose and below that is snap where i cant do anything. It says Missing backends: Discover - flatpack backend, packagekit backend and snap backend, whatever this means?

I in Indonesia where i normaly download from Japan for higher download speeds.

[claydoh]

In Discover's settings, look for the Software Sources button. This will have the mirror selection options in it.