Hey Jamie,
In your Template Editor, look for "snippet-product-item.liquid". Look for this chunk of code:
<div class="coll-prod-meta {% unless settings.show_buy_medallion %}no-medallion{% endunless %}"><a href="{{ product.url | within: collection }}" class="coll-prod-title"> {{ product.title }}</a> {% if product.compare_at_price > product.price %}<p class="coll-prod-price on-sale accent-text"> {{ product.price | money }} <em class="compare-at-price">{{ product.compare_at_price | money }}</em></p> {% else %}<p class="coll-prod-price accent-text"> {% if product.price_varies %}From{% endif %} {{ product.price | money }}</p> {% endif %}</div><!-- .coll-prod-meta -->
and try putting in the vendor in a paragraph tag, like this:
<div class="coll-prod-meta {% unless settings.show_buy_medallion %}no-medallion{% endunless %}"><a href="{{ product.url | within: collection }}" class="coll-prod-title"> {{ product.title }}</a> {% if product.compare_at_price > product.price %}<p class="coll-prod-price on-sale accent-text"> {{ product.price | money }} <em class="compare-at-price">{{ product.compare_at_price | money }}</em></p> {% else %}<p class="coll-prod-price accent-text"> {% if product.price_varies %}From{% endif %} {{ product.price | money }}</p><p> {{ product.vendor | link_to_vendor }}</p> {% endif %}</div><!-- .coll-prod-meta -->