VIA is a keymap configuration software based on QMK, allowing users to set up KEYMAP values (key configurations), MACROS (creating macros so that pressing one key can execute certain actions), SAVE+LOAD (saving and loading settings), and LIGHTING (lighting settings) within the software. QMK is software for custom mechanical keyboard configurations, enabling firmware upgrades, modifying keymaps, saving configuration files, and upgrading them. Here is a detailed introduction to VIA and QMK. 

Make sure your keyboard is QMK/VIA version,  ISO/ANSI layout, wired or wireless mode, if you are not sure,  please verify with the purchase link or sellers.  

   1. copy: usavia.app, then open it on google chrome/Microsoft Edge  

       Or downloading the software from this addrss:  

        https://github.com/the-via/releases/releases  

 2. Obtain the configuration file specific to your keyboard, for example "RK61.json".

       find the corresponding .json file from this link: 

https://en.rkgaming.com/download/12/

Click on "SETTINGS" to access the settings page and enable the "Show Design tab" option.

This will display the "DESIGN" page as shown in the image below. Go to the "DESIGN" page and click on "Load."

Select the "RK61.json" configuration file from the dialog box and open it, as shown in the image below.  

Afterward, you will see a pop-up device dialog in the top left corner. Click on the "RK61" device to establish a connection, as shown in the image below.  

please get more details from this link(take RK61 WIRED qmk version for example）:

http://en.rkgaming.com/news/12/