How to enlarge the logo size in the Home page?

How can I enlarge Logo in Homepage and how can change logo in category page

tks

Please give me more details about the logo size in homepage you wish to customize, so we can have better solution for you.
Also, To change logo in category on the DW Focus theme. you can change the type of categories on your site as the following guideline:
–  Log in to Dashboard > Post > categories. Then select category style
See the screenshot here: http://imgur.com/JUAagcF

To change the logo image in the categories, open the folder in the folder path :  wp-content\themes\dw-focus\assets\colors then look for the style  folder that you want to change the logo and change the logo image as you wish. (Because each style/color has its own logo)
Note:  you need to override our image “logo.png”

Regards,
Dominic

Please find my answer bellow.
To add the logo – size 640 x 70px

Step 1: Log in to Dashboard > Appearance > Widgets > Header in the Sidebar
Delete all the Text widgets of Header in the sidebar. Because the size of logo is too large, so there has no space for other widgets on the Header.
See screenshot: http://i.imgur.com/dkhHHv3.png

Step 2: Go to Dashboard > Appearance > Themes> Customize on the left side of screen
See screenshot: http://i.imgur.com/hO7gYx9.png

Step 3: Choose General Settings, then paste the following code lines into “DW Focus header script”
see screenshot:http://i.imgur.com/K30Tjz5.png

 
.site-header #header {
    background: none;
}

#branding {
    width: 640px !important;
}

.site-header #branding a {
    width: 640px;
    height: 70px;
}

Step 4: Log in to Dashboard > Appearance > Themes > Customize >Select Title & Tagline, then upload the logo with the size 640x70px
And you will have a new site with the logo as you wish.

See screenshot: http://i.imgur.com/yQRmczj.png

Regards,
Dominic