Add span with .input-group-textclass before<input>for input-group-prepend and add span with .input-group-textclass after<input>for input-group-append.

Input Groups can use with checkboxes and radio buttons also. For it add code for .vs-checkbox-conclass and .vs-radio-con.

Add .input-group-{lg/sm}class to .input-groupfor Large/Small addon/prepend.

Add span with .input-group-btnclass and add button inside beforeor after<input>.

Add <button>with .dropdown-toggleclass and add dropdown-menu after it to get input group with dropdown.