If WFS does not appear as an option then you will need to edit the ConTypes.xml file, which you will find in the ...Astun\iShare\n.n\Studio\config folder. If you open ConTypes.xml with a text editor you will see options for DBConType (servers, such as PostgreSQL and Oracle) and FileConTypes (file formats such as shapefile or mapinfo tab). Create a new DBConType entry after the last closing </DBConType> tag (but before the closing </ConnectionTypes> tag as follows:

<DBConType>
	<Name>WFS</Name>
	<FormatName>Web Feature Service</FormatName>
	<Direction>In</Direction>
	<FormatStr>WFS:|$1|</FormatStr>
</DBConType>

Save the changes and re-open iShare Studio.