The liquidity needs to be provided for two tokens. You cannot provide for one token. This is because there is a direct correlation between the exact combination of liquidity you provide with the exact supply and demand provided on TallySWAP. Let's say you provide BNB-TALLY, you will receive your earnings every time someone uses BNB to purchase TALLY, and vice versa.
The beauty of the Tally Protocol is the relationship between Provider and Trader. The Provider earns 0.17% of each trade on their provided pair AND the Trader earns Tally Tokens of 0.03% on their purchase. Earnings on both sides. On the trading side, this is called TallyBACK.