#masthead img,
.widget img {
	border: 0;
}

Thanks

5) Getting rid of white lines shown between share section and below it too.

The share and likes section below single posts in the Blogum theme have thin gray borders by default. Here is an example showing how to remove those borders:

.post-content div.sharedaddy div.sd-block {
	border-top: none;
}

body.single .post-content div.sharedaddy,
body.page .post-content div.sharedaddy {
	border-bottom: none;
}

4) Aligning left hand side menu to the right.

What you see on the left hand side is nor really a side menu, it's the post title and meta data and it's part of each post itself. You can change the float to move it to the right side of the posts instead of the left. Here is an example:

.post-meta {
	float: right;
	padding-left: 1em;
}

3) Modifying font, size and color of right hand side menu, widgets sidebar menu.

Try the Appearance → Custom Design → Fonts options first. If that doesn't help, post a new help request and we can look at something more specific.

2) Getting rid of lines below right hand side menu, widgets sidebar menu.

This will remove the top borders from all of the widgets on the right side of the Blogum theme:

.widget {
	border-top: none;
}

If you wanted to add a border back to the top of all of the right sidebar widgets, add this:

.sidebar {
	border-top: 1px solid #E9E9E9;
}

1) Moving the 1st, 2nd and 3rd columns to the right (e.g. by pixels from left of browser)

You can control that by changing the margin for the main wrapper element in Blogum. Here is an example:

.wrapper {
    margin: 0 0 0 200px;
}

I would greatly appreciate if someone could tell me the necessary CSS codes for modifying the following from http://eyesblinkpictures.wordpress.com:

1) Moving the 1st, 2nd and 3rd columns to the right (e.g. by pixels from left of browser)
2) Getting rid of lines below right hand side menu, widgets sidebar menu.
3) Modifying font, size and color of right hand side menu, widgets sidebar menu.
4) Aligning left hand side menu to the right.
5) Getting rid of white lines shown between share section and below it too.

It be great if it can be done through Custom design CSS.
Many thanks in advanced.
Tomas