So if I buy the further 0.03 ETH reqd and then my holding is 0.1, I can then sell/trade ?

I’ve bought 0.07 Eth/GBP but to trade or sell it says I need 0.1 !!

Is it as simple as buying a further 0.03 to make up to 0.1 or will it mean I now have x 2 options.

Can someone help as to how I move these on, only new to this.

Also, I have GBP deposited and I would like to withdraw but it is saying I need to deposit further before I can then withdraw balance, I’m wary against losing more

Any help please.......