Help for extra fields

[Sled]

I can't get the field to show up in the showthread.
this is in the showthread template {$post['price']}

and my field options are
Fieldname: price
Title: Price
Default message: $
Order: 1
Options
Field: Text input box
Position of the field: checked
Overwrite current fieldname: unchecked
Show in forums: All

any help would be great! there is also no error messages that are showing up