You can go to https://www.void.farm/ and click on liquidity.
Or go to https://exchange.pancakeswap.finance/#/swap. Click on liquidity. Then add liquidity.
Choose the pairs, insert the amount and click on supply.
Then Confirm Supply and it's done!
If you can't see the VOID token go back to https://voidfarm.gitbook.io/void-farm/faq/how-to-buy-void to see how to use the contract in pancakeswap.