
Unless you have set your main page layout to Linear View instead of Boxes View in the
settings, you can almost completely customize your main page.
First, you can edit your Page Title and boxes titles after you click on
Customize My Site (you find this link in the rail, below your headshot) by simply clicking on
Edit in the upper-right corner of these boxes. If you can't, please look at
my previous post for a work-around.
You can move the section boxes also. Just 'grab' them by the
Move link (click on the link and keep the mouse button pressed and the mouse pointer should change to a little hand indicating that you can grab it) and move it to the place you want it. A dashed frame will appear indicating where the box will be after you release it. If you want to arrange them side-by-side, move it to the bottom-right corner, and it should fit just beside the last one. Do this in order to make two columns then arrange them so each section will be in the place you want it. Be aware that it does not work always: some themes allow only one column, but even in these themes you can organize them in the order that pleases you.
Don't want to show a section in your main page? Simple: click on the
Hide link. Made a mistake? Look for
Unhide: links at the top yellow bar that shows up while your are in the 'Customization Mode'. The section will show again on your main page but maybe not at the same place, so look all over the page for it and move it again to the right place.
When you finish, either click on the 'Done' button on the top bar or click again on
Customize My Site to exit the Customization Mode'.
If you are not using it yet, maybe you will have to
download and install a recent version of Firefox, which is much more compatible with Multiply and more secure and better overall.
Large pictures may make the column where the Guestbook is in your main page too wide. Either remove the entry or ask the poster to remove the code. Also, you can add code to your Custom CSS to display a scrollbar instead. And now ou can even disable HTML completely in the comments, take a look at the
Guestbook FAQ post for more info.

Moving content boxes only works if your page is in Boxes View (as opposed to Linear View), of course. To change this, go to
this page. Also, be aware that some themes only allows 1 column of boxes, so you cannot put them side-by-side to make them smaller. If you want this, you have to choose another base theme. You can see which ones allow 2 columns in the
Choose a Theme page.