On the Primitive interface, the liquidity page will display all the option pools along with a connected wallet's provided liquidity. This total liquidity amount is calculated based on the underlying tokens in the pool, along with the underlying tokens released from closing the short option tokens (which are the other asset in the pool).
Select the pool to add liquidity to, and choose "Add liquidity". This will show a deposit input which will allow you to add liquidity to the option pool.
There are no lock periods for liquidity, therefore, any position can be exited at any time. However, "impermanent exposure" may have accrued to your position. This happens when the ratio of short option tokens to underlying tokens has increased, when compared to the ratio when a position was first entered.
When a liquidity position is entered, it receives a proportional amount of long option tokens, which act as a hedge against the short option tokens in the pool. Since the short option token ratio increased, this hedge does not fully cover the accrued short option token "impermanent exposure".
There are three options to exit the position:
Only exit up to the amount that the long option token balance covers (may not be up to 100%).
Purchase long option tokens on the market, to 100% exit the position.
Exit most of the position, and remove the remaining liquidity directly. Hold the "impermanent exposure" amount of short tokens in your wallet.
Short option token exposure will accrue when more options are bought than are sold in the option pool. Long option token exposure will accrue when more options are sold than are bought in the option pool.