The engine oil is called 4T. What bike did you get ? You also
need to locate the drain plug on your bike that drains your 4T. And
I assume you know where to top up the 4T from ? You need the
followings ....
1. a bottle of 4T
2. a metal container for containing your waste oil
3. rags
Steps
1. Place the container under the drain plug
2. Open the drain plug and let the oil drain fully
3. close back the plug
4. top up the oil
That's all there is to it. But be warned. Don't go pour the waste
oil away into your domestic sewrage (eg, your wash basin), or pour
onto open grounds. The oil is toxic and requires special treatment.
If you pour the oil into the areas I mentioned, it'll contaminate
the areas. Please take note of that.
And, like what you've been told, it'll be cheaper and less messy
and more convenient to have the oil changed at a bike shop
.....