Okay, I have got my site in the site manager.
And I have rt.clicked connection, chose actions tab,clicked on Filter, checked 'Enable server side filtering', entered -a in the textbox below, clicked on OK, clicked on Connect.
I have reconnected many times, but still could not find the .htaccess file.
Note: After clicking on the filter button in the actions tab, I get the 'Filter Properties' tab where I changed the Server side filtering part. The part above this has four options out of which, only the first one, that is, 'Enable Filtering' is checked. The rest of the three are however unchecked.