Basic Guidance Sought

I use ODIN for trading. I have some basic question's for which I seek guidance/advise from all

1. I have bought a share for Rs. 100/-, My Target price is Rs. 102/- but I want put a stop loss at Rs. 98/-. How do I put the stop loss in ODIN after my purchase ??

2. I have bought a share for Rs. 100/-, My Target price is Rs. 102/-. The target price is reaching but I feel/assume/see the price will only fall from there & I want to sell again from there. What should I do (e.g should I double the selling quantity)??

Thanks & Regards

Basic Guidance Sought