[TYPO3-english] Indexed_search - how to remove 'Search for' in textbox

[Brian Spring]

Typo3 7.6.15, with indexed_search Extension.

The "Search for"  box has the default words "Search for" .   How / where can one remove those words so that the form initially 
appears with a blank  in the "Search for" box.  

           Search for: [ Search for   ]  

Also, in a related issue,   how and where to  change or modify  the Rules  that are displayed.
We would want to improve the grammar, not make any changes that deviate from the logic of the search engine.

Rules: 
Only words with 2 or more characters are accepted
 Max 200 chars total
 Space is used to split words, "" can be used to search for a whole string (not indexed search then)
 AND, OR and NOT are prefix words, overruling the default operator
 +/|/- equals AND, OR and NOT as operators.
 All search words are converted to lowercase.