Yes, you are able to make withdrawals.
Firstly, the Crowd Bond(s) you hold need to pay interest and/or reach maturity so that you have a cash balance in your IFISA.
Once you have a cash balance, you are then able to apply online to withdraw your money.
Alternatively, you may prefer to transfer money to another ISA, in which case your new ISA provider will contact us to arrange a transfer so that your money retains its ISA status.