Place your cursor in the file at the spot where you want to insert the symbol. Go to Insert > Symbol. Pick a symbol, or choose More Symbols. Scroll up or down to find the symbol you want to insert.

Select Insert > Icons. Scroll through the icons or jump to a category by choosing a name in the navigation pane at the left. You can also search by using the box near the top left corner. Choose an icon and then select Insert at the lower right. Insert multiple icons at the same time by choosing each of them before clicking Insert.