Before you attempt any interface edits, the following are recommended.
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1] Copy the default template folder (as mentioned
here), update your
theme settings to use the new theme, then use the default for reference.
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2] Backup the entire system, including database structure in case you need to start again.
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3] Have a good search program/utility handy. Sometimes you are looking for a specific div / class name and you can`t find it. A quick search on the 'content/*theme*/' folder should find you things quicker. There are a few
great free programs around, a few recommendations are listed below.
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4] Use a good quality text editor to edit files,
DO NOT edit directly on the server. Edit and upload via FTP. Some free text editors / FTP utilities are shown below.
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5] Colours are the next problem. Knowing what the hex code is and where it`s located in any CSS or template file.
ColorCop enables you to pinpoint a colour area pretty quickly, just drag the eyedropper over the colour you are looking for. it`s also free.
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6] Patience. Any developer will tell you this is paramount. If you are getting frustrated, come back to it later.
Note that where *theme* is used, this refers to the theme folder you are using, whether it be the default theme or your own custom theme.