Blog News on slider

Hello, for my site I'm using the blog slider for the news.
Could you kindly let me know how I can change the dot colour in the navigation because I can see the first dot but I cannot see the other dots since they are dark as per my site background.
I need also to know if it is possible to have more than 4 news displayed. 
For example if it is possible to choose 6 news or 8 displayed in two lines of four columns.
Thanks in advance
Best regards
Ci

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