Edit existing content

I have setup word press for my website as a content management system. I used my own template. So I have a simple website with some introduction text. This is the text that I want editable and changeable.

I have wordpress adding text to the pages but cannot edit text already on the webpage. All the text is held in the database but need to know how to call all text page into the pages section of wordpress so I can edit / add or whatever. Then re-upload.

If you need any code samples or further information please ask. Im new to wordpress and php! so any help would be great.

Thank you