[US stocks]

Could some tell me how to close out a US stock on my ISA trading account 

it doesn’t seem to work the same as U.K. stocks?

Regards

[ISA stocks and shares]

I’ve opened an ISA trading account and I have a few question before deposit funds.

 

1.Is there any margin call in this account or can a trade be closed or reduced if a trade declines? If not does the value just drop proportionality?  

 

2. Can profits be withdrawn on an open trade?

 

3. If the maximum of £20k is deposited and u make profit can more than £20k be traded on further trades and if so is the sum more than £20k taxable if profits are made?

 

4. When opening the ISA account I had to open a share dealing account, what was the reason for this and do I have to use it? 

Thanks in advance