Yes. You can make as many withdrawals as you like from this account and there are no charges for doing so.
This is a flexible ISA. This means if you are a UK resident and make a withdrawal, you can pay that money back in to this account before the end of tax year and not affect the amount you can save in your cash ISA tax free.
If you're not a UK resident, you can withdraw some of your money but you can't replace this money or save any more.
Any money you move to an account that isn't an ISA will lose its tax-free status. Tax treatment depends on your individual circumstances and may change in the future.
You can close your account at any time.