lower case

There is no option in the theme however you use this css to make it lower case

#nav li a {text-transform: none;}
.post_title a {text-transform:none}

thanks! can i ask something else?
i want to change the letters in widget: “recent posts” & and in the slider too, to appear lower case. can it be done?

Yes

.widget h2{text-transform:none}

hmmm… this will change and the slider?
btw where exactly i will write the code?

Use a custom css plugin and paste these css there.
And for slider use this

.featured_content h3 {text-transform:none}

slider done
in “recent posts” i want to change the name of posts, no the name of widget.