The best way to purchase the Pension Plan token is through Trader Joe.
Pension Plan contract:
0xd0563981779a00f18cd2cf3f786f90bb9e6d1369
You can use any wallet, which allows you to interact with Uniswap and receive the redistribution. For example Coinbase wallet or Trust wallet. If you do not have any wallet you can use MetaMask as well. Find out how to buy with MetaMask bellow.