1- how to change theme:

Orange blogs offers different themes for your blog that you can choose from

easily go to appearance tab and choose themes you will find an screen with all theme available simply click on the screen shot and you will be presented with a screen to activate the chosen theme

2- how to add video and photo gallery

to add a video go to a new post or new page and you find icons in the editor showing from where you could post a video there are a lot of options like You Tube video for You Tube just copy URL from You Tube and paste it in the space created for you or Google video or your own video, your own video has to be in FLV (Flash Video format)

3- adding a already created Photo Gallery easily click on the Gallery icon and you will be presented with which Photo Gallery to choose from one of your Galleries, you have to create a Photo Gallery from the Photo Gallery  tab

4- how to add a new page:

to add a page go to pages tab and choose add new

5- how to activate Video and Photo Gallery plugins

go to plugins tab and chooose activate