Thanks for the answer! Unfortunately, I do not seem to be able to have it working. I have input the data like this: 
Maybe you could tell me what I am doing wrong? I am receiving "R error (1565083554)".
Hello, I'm working with a set of RNA-seq data which I want to analyze the Gene Ontolgy Enrichment and the metabolic pathways from Kegg. I have already checked the Pathways and the GO using the hypergeometric test, but I wanted to cross check the results using the Gene Set Enrichment.
Optimally I would like a tool that takes the output of Deseq in some shape and form and runs the GSE test. I have tried GSEA but the results are not what I was expecting (using the metric of -log(pvalue) * sign(logFC)). What tools are currently being used successfully for this kind of analysis?
To date, WebGestalt is probable the best tool for GSEA analysis. You can use any ranked list, such as the log2fold from deseq.
Thanks for the answer! Unfortunately, I do not seem to be able to have it working. I have input the data like this: 
Maybe you could tell me what I am doing wrong? I am receiving "R error (1565083554)".
Yes, I have noticed that error, FDR as a significance level apparently is not working, change it to TOP 30 (for example). This page is in continuous and exhaustive updates, so I hope it will be fixed soon.
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I use the same score in my ranking function. For GSEA and enrichment, I use clusterProfiler: http://bioconductor.org/packages/release/bioc/html/clusterProfiler.html
You can pass in pathway annotations from msigdbr, reactome, GO, KEGG etc etc
Thanks for the answer! I have managed to use it and it works pretty well, even tho I had to modify my data a bit, as I am using custom pathway annotations.