UserForm for data entry

i have problem in User-form i program. i am not the pro.but i learning from this forum a lot so thanks every one especial moderators.
as u can see in atteched file User-form "frmEntry" work fine to update the data in Trader worksheet. but i need help to program.for the "frmExit" which i program. u can look in to the database "Trader Worksheet" .it enter the data in next available row.instead of up dating the corresponding existing stock ticker.to sell the stock.also when i enter the second sell of stock it change the row which is already their.not in new row.

so pl some one can help me to program this will be greatly appreciated