Change position of caption in a float-figure

[Susanne Gütter]

Hi all,

how can I change the position of the caption in a floatfigure? 
The command 
\align left 
enclosed to the lyx-file in a texteditor
does it only in lyx. When I convert to ps, then there is the LaTeX Error: 
Something's wrong--perhaps a missing \item.
 ...Plot}Log-Log-Plot \protect\end{flushleft}}
                                                  
Try typing  <return>  to proceed.
If that doesn't work, type  X <return>  to quit.

Best regards

Susanne