How to change a propane tank on a forklift

There is an excellent online article what is the true capacity of my forklift for a more thorough explanation of forklift capacity. 2015 toyota 8fgcu25 forklift truck withside shifting fork positioner with 83.1 lowered / 189 raised full free lift hi-visibility 3-stage mast 4-way hydraulic's with side shifting fork positioner (forks go side-to-side and together & apart).