What version of Premiere Elements are you using and on what computer operating system is it running on?
What are the properties of the media that you have on the Timeline and what is the project preset?
In the absence of details such as that, I would generalize and suggest that, if applicable for your version, look at
sharing opportunities under ...Computer/AVCHD and the presets there which are applicable to your situation.
And, be aware that you can change those settings, if necessary, under the Advanced Button of the preset
Please review and then do not hesitate to ask if you need clarification on anything that I have written. But, please do
include the details mentioned.
In addition to the questions asked, what player is available on the desired target Web page?
The embedded player will, in most cases, dictate what can be played from the page. If there is no embedded player, then one can often be added, or linked to.