Topic Title (EnterTitle Here) Cant type in that box only

https://ihostimages.uk/images/2019/04/02/chrome_2019-04-02_09-50-01.png

in the image above you will see the enter title box its the only box i am having trouble with you can not click to enter no text on it all the other boxes are fine. also how do i change the colour of the file insert etc back ground or txt?