The main order entry tool appears at the bottom of your screen and can help you create several common orders (check out Order Types for a complete list). You can easily open this tool by clicking BUY or SELL for a symbol. 

Once opened, click the dropdown in the Order column to select an order type. The entry tool will then change to the order template for that type. 

Notice how the order price, except for ~MKT market orders, automatically changes based on underlying mark price. This is an unlocked price value and can be “locked” by clicking the % lock icon next to the price.

• An open lock %is an unlocked price that changes as the underlying changes. 
• A closed lock & is a locked price that doesn’t automatically change.

Locked prices don’t change automatically but can be adjusted using the + and – buttons. Regardless of order type you can always type in or use the + and – buttons to adjust order price.

This page covers the following content:

• Market Orders
• Limit Orders
• Stop Orders
• Stop Limit Orders
• Trailing Stop and Trailing Stop Limit Orders
• Market on Close (MOC) Orders
• Limit on Close (LOC) Orders
• Order Rules

If you are interested in learning about Walk Limit® orders, please refer to this page.