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You need to make use of a video editing software and import your video at first. Then you find the certain image you want to edit and capture this image from the video, we call the image in video as frames. So you can edit freely on the frame with photo editing tools in video editor. A good one is ArcSoft ShowBiz 5.
I need to edit this video before I put it on youtube.
Use Sony Vegas or some edit thingies
You should use a video editing program, not a website. Most browser-based video editing software is not up to par with the software built as applications on your computer.
You can use the default Windows Movie Maker to edit videos.
This depends on how it is being distributed. If the video is streaming (real-time) then you won't be able to edit it first. If it is prerecorded you could use various programs to edit the material before distribution.
There is an inbuilt editing tool which allows you to edit the length of the video but for the best editing you would need to download iMovie from the app store and use that to edit and add stuff to your videos.
If I understand your question correctly, you are looking for a program to remove unwanted ads from videos. For this purpose, the program Video Splitter from Solveig Multimedia is excellent, among the many functions in this video editor is the removal of advertising. If you need to edit directly advertising video, this program can also cope with this task.
Timeline use is to create animated GIF image or to edit video inside Photoshop.
You have to edit it and use the voice changer thing on it to make your voice deep and stuff
To cut and edit video footage effectively in Premiere Pro, start by importing your footage, then use the razor tool to cut clips where needed. Arrange the clips on the timeline, add transitions, effects, and audio as desired. Use the editing tools like the trim tool to refine the timing and pacing of your video. Finally, export your edited video in the desired format.
I use MPEG Video Wizard DVD and PowerDirector as my video editing software.