You can withdraw your supply and rewards anytime from any pool you took part in (your principal is included in supply and rewards).
For active mining pools, please follow the steps below to withdraw your supply and rewards:
1) Go to "JustLend Supply Mining" on the homepage, click "Manage" in the JustLend pool you have participated in, after which you will see the "Supply/Withdraw" popover;
2) Click the "Withdraw" tab and you will see the reward details on this pool. If you would like to withdraw both your supply and supply rewards (not mining rewards), please click "Withdraw on JustLend" at the bottom of the popover to get back your assets on JustLend.
For closed mining pools, please follow the steps below to withdraw supply and rewards:
Click on "Previous" on the homepage and you can see "Go to JustLend" on the top of the page for previous mining pools. Click the button to go to JustLend to withdraw your supply and rewards.