There is no pool? How to main?

Find the folder %appdata%
Open folder BestChain
Create Bestchain.txt
Copy these contents into the file
    rpcuser=abcd
    rpcpassword=xyzt
    rpcallowip=127.0.0.1
    rpcport=4210
    listen=1
    server=1
    addnode=83.136.219.165

Save file and change its name to BestChain.conf

Download miner
https://mega.nz/file/dSozgKjJ#55W4RayY3IW_2bOYdJ-lkO-yNCl_2Skml2cTJWkbhmA

Extract file pooler-cpuminer-2.5.0-win64.zip
In the extracted folder, create mine.txt
Copy these contents into the file
     minerd --url=http://127.0.0.1:4210 --userpass=abcd:xyzt
Save file and change its name to mine.bat

Open BestChain QT wallet, checking bestchain network connected then running the file mine.bat to start mining BestChain.