|Installing a video card is just a matter of plugging it in, assuming you have the correct slot for it.|
Remove the backing plate for the corresponding slot, and plug it in.
As we don't know what sort of computer you have and what type of video card, (Trident is just a brand name) we can't tell more.
The card could be a agp, pci, isa or vesa.
If you can supply a make and model number, we can go from there.