Copy / paste this code into your site
var lengthsummary = 155; //Number of characters to limit summary to
var numofpost=5 number of post to view given 5 post, change how many you would prefer
*** Note - Troubleshooting***
There is a problem on copying this widget. So to settle this do not use the html frame above but use this link form the other host, nowadays blogspot prevent copying long text.