Increasing the size of text Filed in vB 3.7.3?

[vb installer]

I am using 3.7.3 with vbseo
i need to increase the size of text filed i am using totally pro skin and using custom smiles ...
pls help me to increse the field size....

Here>...is my screenshot....

 

[dark_hunter]

Click the

and the box will expand.