Well for such guys,the above link will be useful.
If they dont understand still,I will try adding a Tutorial.
But let me get a pc because,while adding it must be with pics also to be good.
If some one adds like that,it would be good.

IMG tool is used to replace,extract samp files where as SAMI is used to install mods.

I recommend both because some times we might need IMG tool for extracting and editing txd files.
Where as SAMI can be used to add several mod files just through a single replacement.
I.e. Not a single file is being replaced,it's done through a single click.