急知Paypal點樣過錢去我銀行戶口

我沒有信用咭,所以申請左個Personal Account,　我收到對方$後個 Paypal account balance 顯示出嚟. 跟住我註册銀行户口 (然後: log in 入 Paypal -> profile -> bank accounts -> add). 完成後 click [withdraw] -> [transfer funds to your bank account] -> 跟住螢幕顯去做,但入到去之後,佢有一個空格(. Amount: ),
請問我應該打D咩數字呀?因為我試左好多個數字都唔得呀!!淨係彈呴(Funds withdrawn must not exceed your available balance)........唔明白
例如:
From This Balance:
$74.93 HKD
咁 Amount　應該打D咩