how can i type on a document

I moved a chart type document onto libre office. Now I want to fill in the blanks and print. how do I type on the document? Help

It would help a great deal if you told us which software was used to create the document in the first place and what is the “extension” at the end of the document’s file name. Also which version of LibreOffice are you using, and whether you are using LO Writer or Calc to display it now. In addition, when you opened the document did you get a warning that the document was in “read-only mode”?